are you actually comparing the decision to wear a shirt to being born with a certain skin color?
did someone in your klan chapter tell you that was a good idea or something?
No. I am making a comparison of ways to notice a person of the intended use of your property, regardless of the reason.
You and I might disagree with how a person, especially a racist, chooses to use their property, but we could agree that it is polite and reasonable to give people advance notice of the property owners intentions. Signs are a good way to notice people in general too.